<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8" />
		<title>Document</title>
	</head>
	<body>
		<button id="btn1">点我</button>
		<h2 id="h2">你好啊</h2>
		<script type="text/javascript" >
			// const btn1 = document.getElementById('btn1')
			// const h2 = document.getElementById('h2')
			console.log(btn1)
			console.log(h2)
		</script>
	</body>
</html>